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Neutral Point Potential Balancing Algorithm at Low Modulation Index for Three-Level Inverter Medium-Voltage Drives | IEEE Journals & Magazine | IEEE Xplore

Neutral Point Potential Balancing Algorithm at Low Modulation Index for Three-Level Inverter Medium-Voltage Drives


Abstract:

Three-level inverters produce low harmonic distortion of the ac currents even when operated at moderate switching frequency. This makes them the preferred candidates for ...Show More

Abstract:

Three-level inverters produce low harmonic distortion of the ac currents even when operated at moderate switching frequency. This makes them the preferred candidates for high-power medium-voltage applications. To improve the utilization of the semiconductor devices, synchronous optimal pulsewidth modulation is employed. This permits reducing the switching frequency to very low values. Carrier modulation is maintained in the lower range of the modulation index. Operation at very low switching frequency increases the steady-state ripple of the neutral point potential. An intrinsic natural balancing mechanism of the neutral point clamped inverter topology eliminates long-term neutral point potential offsets. Transient conditions, however, may create successive increments of the offset to high values, which requires fast compensation. The novel method of selecting the appropriate redundant inverter sub-bridge meets this requirement without incurring additional penalties. The effectiveness of the approach is documented by experiments obtained from a medium-voltage motor drive fed by a 1-MVA three-level inverter
Published in: IEEE Transactions on Industry Applications ( Volume: 43, Issue: 3, May-june 2007)
Page(s): 761 - 768
Date of Publication: 29 May 2007

ISSN Information:

Author image of Joachim Holtz
Electrical Machines and Drives Group, University of Wuppertal, Wuppertal, Germany
Joachim Holtz (M'87–SM'88–F'93) received the Dipl.-Ing. degree and the Ph.D. degree from the Technical University Braunschweig, Braunschweig, Germany, in 1967 and 1969, respectively.
In 1969, he was an Associate Professor and, in 1971, a Full Professor and Head of the Control Engineering Laboratory, Indian Institute of Technology, Madras, India. He was with the Siemens Research Laboratories, Erlangen, Germany, in 1972. Fro...Show More
Joachim Holtz (M'87–SM'88–F'93) received the Dipl.-Ing. degree and the Ph.D. degree from the Technical University Braunschweig, Braunschweig, Germany, in 1967 and 1969, respectively.
In 1969, he was an Associate Professor and, in 1971, a Full Professor and Head of the Control Engineering Laboratory, Indian Institute of Technology, Madras, India. He was with the Siemens Research Laboratories, Erlangen, Germany, in 1972. Fro...View more
Author image of Nikolaos Oikonomou
Electrical Machines and Drives Group, University of Wuppertal, Wuppertal, Germany
Nikolaos Oikonomou (S'05) was born in Thessaloniki, Greece, in 1977. He received the Dipl.-Ing. degree in electrical engineering from Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2000. He is currently working toward the Doctoral degree at the Electrical Machines and Drives Laboratories, University of Wuppertal, Wuppertal, Germany.
His research interests include control methods for high-power converters an...Show More
Nikolaos Oikonomou (S'05) was born in Thessaloniki, Greece, in 1977. He received the Dipl.-Ing. degree in electrical engineering from Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2000. He is currently working toward the Doctoral degree at the Electrical Machines and Drives Laboratories, University of Wuppertal, Wuppertal, Germany.
His research interests include control methods for high-power converters an...View more

I. Introduction

The three-level-inverter topology offers reduced harmonic distortion of the output current and low-voltage stress of the semiconductor switches [1]. It enables operation at very low switching frequency and hence is a preferred solution for high-power medium-voltage applications. Of particular interest is the neutral point clamped (NPC) topology [2], the circuit diagram of which is shown in Fig. 1.

Circuit diagram of a three-level inverter, npc topology.

Author image of Joachim Holtz
Electrical Machines and Drives Group, University of Wuppertal, Wuppertal, Germany
Joachim Holtz (M'87–SM'88–F'93) received the Dipl.-Ing. degree and the Ph.D. degree from the Technical University Braunschweig, Braunschweig, Germany, in 1967 and 1969, respectively.
In 1969, he was an Associate Professor and, in 1971, a Full Professor and Head of the Control Engineering Laboratory, Indian Institute of Technology, Madras, India. He was with the Siemens Research Laboratories, Erlangen, Germany, in 1972. From 1976 to 1998, he was a Professor and Head of the Electrical Machines and Drives Laboratory, University of Wuppertal, Wuppertal, Germany. He is currently a Professor Emeritus and a Consultant. He has extensively published, among others 12 invited journal papers. He is the coauthor of four books and the holder of 31 patents.
Dr. Holtz was the recipient of 12 IEEE Prize Paper Awards. He was also the recipient of the IEEE Industrial Electronics Society Dr. Eugene Mittelmann Achievement Award, the IEEE Industry Applications Society Outstanding Achievement Award, the IEEE Power Electronics Society William E. Newell Field Award, the IEEE Third Millenium Medal, and the IEEE Lamme Gold Medal. He was Editor-in-Chief of the IEEE Transactions on Industrial Electronics, Distinguished Lecturer of the IEEE Industry Applications Society and IEEE Industrial Electronics Society, Senior AdCom member of the IEEE Industrial Electronics Society, Chair of the IEEE Industry Applications Society Fellow Committee, and member of the Static Power Converter Committee, IEEE Industry Applications Society.
Joachim Holtz (M'87–SM'88–F'93) received the Dipl.-Ing. degree and the Ph.D. degree from the Technical University Braunschweig, Braunschweig, Germany, in 1967 and 1969, respectively.
In 1969, he was an Associate Professor and, in 1971, a Full Professor and Head of the Control Engineering Laboratory, Indian Institute of Technology, Madras, India. He was with the Siemens Research Laboratories, Erlangen, Germany, in 1972. From 1976 to 1998, he was a Professor and Head of the Electrical Machines and Drives Laboratory, University of Wuppertal, Wuppertal, Germany. He is currently a Professor Emeritus and a Consultant. He has extensively published, among others 12 invited journal papers. He is the coauthor of four books and the holder of 31 patents.
Dr. Holtz was the recipient of 12 IEEE Prize Paper Awards. He was also the recipient of the IEEE Industrial Electronics Society Dr. Eugene Mittelmann Achievement Award, the IEEE Industry Applications Society Outstanding Achievement Award, the IEEE Power Electronics Society William E. Newell Field Award, the IEEE Third Millenium Medal, and the IEEE Lamme Gold Medal. He was Editor-in-Chief of the IEEE Transactions on Industrial Electronics, Distinguished Lecturer of the IEEE Industry Applications Society and IEEE Industrial Electronics Society, Senior AdCom member of the IEEE Industrial Electronics Society, Chair of the IEEE Industry Applications Society Fellow Committee, and member of the Static Power Converter Committee, IEEE Industry Applications Society.View more
Author image of Nikolaos Oikonomou
Electrical Machines and Drives Group, University of Wuppertal, Wuppertal, Germany
Nikolaos Oikonomou (S'05) was born in Thessaloniki, Greece, in 1977. He received the Dipl.-Ing. degree in electrical engineering from Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2000. He is currently working toward the Doctoral degree at the Electrical Machines and Drives Laboratories, University of Wuppertal, Wuppertal, Germany.
His research interests include control methods for high-power converters and optimized pulsewidth modulation techniques.
Nikolaos Oikonomou (S'05) was born in Thessaloniki, Greece, in 1977. He received the Dipl.-Ing. degree in electrical engineering from Aristotle University of Thessaloniki, Thessaloniki, Greece, in 2000. He is currently working toward the Doctoral degree at the Electrical Machines and Drives Laboratories, University of Wuppertal, Wuppertal, Germany.
His research interests include control methods for high-power converters and optimized pulsewidth modulation techniques.View more
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